Model development for nanosecond laser-induced damage caused by manufacturing-induced defects on potassium dihydrogen phosphate crystals

Yang, Hao and Cheng, Jian and Liu, Zhichao and Liu, Qi and Zhao, Linjie and Tan, Chao and Wang, Jian and Chen, Mingjun (2020) Model development for nanosecond laser-induced damage caused by manufacturing-induced defects on potassium dihydrogen phosphate crystals. ACS Omega, 5 (31). pp. 19884-19895. ISSN 2470-1343 (https://doi.org/10.1021/acsomega.0c02950)

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Abstract

Nanosecond laser-induced damage on (potassium dihydrogen phosphate) KDP crystals is a complex process, which involves coupled actions of multi-physics fields. However, the mechanisms governing the laser damage behaviors have not been fully understood and there have been no available models to accurately describe this complex process. In this work, based on the theories of electromagnetic, thermodynamic, and hydrodynamic fields, a coupled multi-physics model is developed to describe the transient behavior of laser-supported energy deposition and diffusion accompanied by the surface defect (e.g., surface cracks)-initiated laser damage process. It is found that the light intensification caused by the defects near the crystal surface plays a significant role in triggering the laser-induced damage, and a large amount of energy is quickly deposited via the light intensity-activated nonlinear excitation. Using the developed model, the maximum temperature of the crystal material irradiated by a 3 ns pulse laser is calculated, which agrees well with previously reported experimental results. Furthermore, the modeling results suggest that physical processes such as material melting, boiling, and flowing have effects on the evolution of the laser damage process. In addition, the experimentally measured morphology of laser damage sites exhibits damage features of boiling cores, molten regions, and fracture zones, which are direct evidence of bowl-shaped higherature expansion predicted by the model. These results well validate that the proposed coupled multi-physics model is competent to describe the dynamic behaviors of laser damage, which can serve as a powerful tool to understand the general mechanisms of laser interactions with KDP optical crystals in the presence of different defects.

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• Item metadata

  Item type:	Article
  ID code:	81163
  Dates:	Date Event 11 August 2020 Published 29 July 2020 Published Online 15 July 2020 Accepted
  Notes:	This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
  Subjects:	Science > Chemistry
  Department:	Faculty of Engineering > Design, Manufacture and Engineering Management
  Depositing user:	Pure Administrator
  Date deposited:	17 Jun 2022 05:39
  Last modified:	09 Apr 2024 03:19
  URI:	https://strathprints.strath.ac.uk/id/eprint/81163